Betting Odds Converter 2025
Convert between decimal, fractional, and American odds formats instantly. Our free odds converter includes probability calculations and visual representations to help you understand betting odds better.
Odds Converter
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Understanding Odds Formats
Decimal Odds
Popular in Europe and online betting. Shows total return for 1 unit stake.
Example:
2.50 means €25 return on €10 stake
Fractional Odds
Traditional UK format. Shows profit relative to stake.
Example:
3/2 means €15 profit on €10 stake
American Odds
Used in US. Shows profit on €100 stake or stake needed for €100 profit.
Example:
+150 means €150 profit on €100 stake
Frequently Asked Questions
How do I convert decimal odds to fractional odds?
To convert decimal odds to fractional odds, subtract 1 from the decimal odds, then find the simplest fraction. For example, decimal odds of 2.50 become (2.50 - 1) = 1.50, which converts to 3/2. Our calculator does this automatically for you.
What's the difference between American and decimal odds?
Decimal odds show your total return from a 1 unit stake (e.g., 2.50 means 2.50x return), while American odds show how much you need to bet to win 100 units (+150) or how much you win from a 100 unit bet (-150). Our converter helps you understand and switch between these formats.
How do I calculate implied probability from odds?
For decimal odds, divide 1 by the decimal odds and multiply by 100 to get the implied probability percentage. For example, odds of 2.50 give an implied probability of (1/2.50) × 100 = 40%. Our calculator automatically shows probability for any odds format.
Which odds format is most common?
Decimal odds are most common in Europe and online betting, fractional odds are traditional in the UK and Ireland, and American odds are standard in the United States. Our converter lets you easily switch between all formats regardless of your location.
Why do odds differ between bookmakers?
Bookmakers set different odds based on their own risk assessment, market movements, and profit margins. This creates opportunities for value betting, where you can find better odds by comparing across bookmakers.